4.1.2 Thermal Limitation Curve
WARNING
EXPLOSION DANGER
Always use the thermal limitation curve in combination
with Ex-e and Ex-n motors. See
Illustration 4.2
.
The output current/motor speed is permanently monitored
and limited depending on the characteristic given by the
motor manufacturer on the motor nameplate and data
sheets.
1.
Programme the characteristic values as
frequency/current pairs in parameters
1-98 ATEX
ETR interpol. points freq.
and
1-99 ATEX ETR interpol
points current
.
1 0 0 %
8 0 %
4 0 %
5 Hz
15 Hz
25 Hz
50 Hz
130BB909.10
Illustration 4.2 Example of ATEX ETR Thermal Limitation Curve
1-98 ATEX ETR interpol. points freq. 1-99 ATEX ETR interpol
points current
[0]=5 Hz
[0]=40%
[1]=15 Hz
[1]=80%
[2]=25 Hz
[2]=100%
[3]=50 Hz
[3]=100%
Table 4.2 Ratio between Motor Speed and Motor Current
130BD888.10
CONVERTER SUPPLY
VALID FOR 380 - 415V FWP 50Hz
3 ~ Motor
MIN. SWITCHING FREQ. FOR PWM CONV. 3kHz
l = 1.5XI
M,N
t
OL
= 10s
t
COOL
= 10min
MIN. FREQ. 5Hz
MAX. FREQ. 85 Hz
PWM-CONTROL
f [Hz]
Ix/I
M,N
PTC
°C
DIN 44081/-82
Manufacture xx EN 60079-0
EN 60079-7
СЄ
1180
Ex-e ll T3
5
15
25
50
85
0.4
0.8
1.0
1.0
0.95
1
2
3
4
xЗ
1
Minimum switching frequency
2
Maximum current
3
Minimum motor frequency
4
Maximum motor frequency
Illustration 4.3 Motor Nameplate Showing Frequency
Converter Requirements
2.
Use the 4 current points [A] from the motor
nameplate.
3.
Calculate the values as a percentage of nominal
motor current and enter it into the array.
I
x
× 100
I
m, n
%
4.
Programme all frequency/current limit points
from the motor nameplate or motor data sheet.
5.
Enter frequency settings for
1-98 ATEX ETR
interpol. points freq.
in Hz, not RPM.
4.2 Parameter Set-up
4.2.1 Alarm Handling
The digital input is configured in parameter group
5-1*
Digital Inputs
.
Digital input function
Select
Terminal
No operation
[0]
All *terminals 32, 33
Reset
[1]
All
...
PTC Card 1
[80]
All
...
Table 4.3 5-1* Digital Inputs
Commissioning
Operating Instructions
MG33V302
Danfoss A/S © 01/2015 All rights reserved.
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